Billionaire hedge-fund investor Paul Tudor Jones says the U.S. stock market is likely to face a difficult year in 2027, describing it as potentially the most challenging period since 2002. He points to factors that could change the balance of supply and demand for equities and says the market’s current “AI-and-rest” split resembles conditions seen in 1999.

Across outlets, Jones links the outlook to a potential increase in equity supply as companies, including major technology firms, issue more stock through IPOs and other mechanisms. Several reports also emphasize that tailwinds that have supported the recent rally—particularly corporate buybacks—may weaken. CNBC adds that mergers and acquisitions, another factor that has helped buoy equities, could also turn less supportive going into 2027.

While the outlets differ slightly in how they frame the timeline and the emphasis, they converge on Jones’s central message: an AI-driven bull market could face headwinds from rising issuance and a changing corporate capital-spending and deal-making environment.